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| Emission characteristics of fine particulate matter at different combustion phases of residential coal |
| LI Peng1, WU Hua-cheng1, ZHOU Wei-qing1, ZHANG Zi-jian2, WANG Mei-shun3, LI Chuang4, YE Kun4, XUE Chun-yu4, KANG Xi1, ZHOU Zi-long1 |
1. Jibei Electric Power Research Institute, State Grid Jibei Electric Power Co., Ltd., North China Electric Power Research Institute Company Limited, Beijing 100045, China;
2. State Grid Jibei Electric Power Co., Ltd., Beijing 100054, China;
3. State Grid Corporation of China, Beijing 100031, China;
4. College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China |
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Abstract The mass distribution characteristics of PM2.5 particles during different combustion phases of residential coal were studied in this work. PM2.5 particles during the flaming phase of burning bituminous coal in an over-fire stove were mainly particulate matters (PM) with diameter below 0.2μm (d50=0.15μm) and peaked at 0.2~0.5μm (d50=0.38μm) during the fuel-adding and smoldering phases. Their mass ratio was between 46.6% and 68.97%. On the other hand, PM emitted from the whole process of burning briquettes in an under-fire stove were mainly below 0.2μm, and the mass ratio was 44.64%~56.24%. The scanning electron microscopy (SEM) observation showed that the PM2.5 particles emitted from coal-burning were cluster-like structure formed by the aggregation of a large number of ultrafine particles. Also, the emission factor (EF) of PM2.5 calculated by the carbon balance approach of the bituminous and over-fire stove in the fuel-adding phase was 4.72g/kg, which was 12 and 11 times of that in the flaming and smoldering phases respectively. The replacement of bituminous to briquette will result in the reduction of PM2.5 EFs by 90.9% during the fuel-adding phase, leading to a significant decrease in PM2.5 emission.
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Received: 24 March 2020
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